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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36540736bb13c79097569ab8f96f85ee7ad436fb4dcecb1c2955373849cc3ffd' 
  AND token = 'J/n6rVO43y2G3yN0ydULNykU2bI4K+IEacNx67rrqfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}